fixpath.c revision 1789:11b31df300ae 
1/*
2 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26#include <Windows.h>
27#include <io.h>
28#include <stdio.h>
29#include <string.h>
30#include <malloc.h>
31
32void report_error(char const * msg)
33{
34  LPVOID lpMsgBuf;
35  DWORD dw = GetLastError();
36
37  FormatMessage(
38      FORMAT_MESSAGE_ALLOCATE_BUFFER |
39      FORMAT_MESSAGE_FROM_SYSTEM |
40      FORMAT_MESSAGE_IGNORE_INSERTS,
41      NULL,
42      dw,
43      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
44      (LPTSTR) &lpMsgBuf,
45      0,
46      NULL);
47
48  fprintf(stderr,
49          "%s  Failed with error %d: %s\n",
50          msg, dw, lpMsgBuf);
51
52  LocalFree(lpMsgBuf);
53}
54
55/*
56 * Test if pos points to /cygdrive/_/ where _ can
57 * be any character.
58 */
59int is_cygdrive_here(int pos, char const *in, int len)
60{
61  // Length of /cygdrive/c/ is 12
62  if (pos+12 > len) return 0;
63  if (in[pos+11]=='/' &&
64      in[pos+9]=='/' &&
65      in[pos+8]=='e' &&
66      in[pos+7]=='v' &&
67      in[pos+6]=='i' &&
68      in[pos+5]=='r' &&
69      in[pos+4]=='d' &&
70      in[pos+3]=='g' &&
71      in[pos+2]=='y' &&
72      in[pos+1]=='c' &&
73      in[pos+0]=='/') {
74    return 1;
75  }
76  return 0;
77}
78
79/*
80 * Replace /cygdrive/_/ with _:/
81 * Works in place since drive letter is always
82 * shorter than /cygdrive/
83 */
84char *replace_cygdrive_cygwin(char const *in)
85{
86  size_t len = strlen(in);
87  char *out = (char*) malloc(len+1);
88  int i,j;
89
90  if (len < 12) {
91    memmove(out, in, len + 1);
92    return out;
93  }
94
95  for (i = 0, j = 0; i<len;) {
96    if (is_cygdrive_here(i, in, len)) {
97      out[j++] = in[i+10];
98      out[j++] = ':';
99      i+=11;
100    } else {
101      out[j] = in[i];
102      i++;
103      j++;
104    }
105  }
106  out[j] = '\0';
107  return out;
108}
109
110void append(char **b, size_t *bl, size_t *u, char *add, size_t addlen)
111{
112  while ((addlen+*u+1) > *bl) {
113    *bl *= 2;
114    *b = (char*) realloc(*b, *bl);
115  }
116  memcpy(*b+*u, add, addlen);
117  *u += addlen;
118}
119
120/*
121 * Creates a new string from in where the first occurrence of sub is
122 * replaced by rep.
123 */
124char *replace_substring(char *in, char *sub, char *rep)
125{
126  int in_len = strlen(in);
127  int sub_len = strlen(sub);
128  int rep_len = strlen(rep);
129  char *out = (char *) malloc(in_len - sub_len + rep_len + 1);
130  char *p;
131
132  if (!(p = strstr(in, sub))) {
133    // If sub isn't a substring of in, just return in.
134    return in;
135  }
136
137  // Copy characters from beginning of in to start of sub.
138  strncpy(out, in, p - in);
139  out[p - in] = '\0';
140
141  sprintf(out + (p - in), "%s%s", rep, p + sub_len);
142
143  return out;
144}
145
146char* msys_path_list; // @-separated list of paths prefix to look for
147char* msys_path_list_end; // Points to last \0 in msys_path_list.
148
149void setup_msys_path_list(char const * argument)
150{
151  char* p;
152  char* drive_letter_pos;
153
154  msys_path_list = strdup(&argument[2]);
155  msys_path_list_end = &msys_path_list[strlen(msys_path_list)];
156
157  // Convert all at-sign (@) in path list to \0.
158  // @ was chosen as separator to minimize risk of other tools messing around with it
159  p = msys_path_list;
160  do {
161    if (p[1] == ':') {
162      // msys has mangled our path list, restore it from c:/... to /c/...
163      drive_letter_pos = p+1;
164      *drive_letter_pos = *p;
165      *p = '/';
166    }
167
168    // Look for an @ in the list
169    p = strchr(p, '@');
170    if (p != NULL) {
171      *p = '\0';
172      p++;
173    }
174  } while (p != NULL);
175}
176
177char *replace_cygdrive_msys(char const *in)
178{
179  char* str;
180  char* prefix;
181  char* p;
182
183  str = strdup(in);
184
185  // For each prefix in the path list, search for it and replace /c/... with c:/...
186  for (prefix = msys_path_list; prefix < msys_path_list_end && prefix != NULL; prefix += strlen(prefix)+1) {
187    p=str;
188    while ((p = strstr(p, prefix))) {
189      char* drive_letter = p+1;
190      *p = *drive_letter;
191      *drive_letter = ':';
192      p++;
193    }
194  }
195
196  return str;
197}
198
199char*(*replace_cygdrive)(char const *in) = NULL;
200
201char *files_to_delete[1024];
202int num_files_to_delete = 0;
203
204char *fix_at_file(char const *in)
205{
206  char *tmpdir;
207  char name[2048];
208  char *atname;
209  char *buffer;
210  size_t buflen=65536;
211  size_t used=0;
212  size_t len;
213  int rc;
214  FILE *atout;
215  FILE *atin;
216  char block[2048];
217  size_t blocklen;
218  char *fixed;
219
220  atin = fopen(in+1, "r");
221  if (atin == NULL) {
222    fprintf(stderr, "Could not read at file %s\n", in+1);
223    exit(-1);
224  }
225
226  tmpdir = getenv("TEMP");
227  if (tmpdir == NULL) {
228#if _WIN64
229    tmpdir = "c:/cygwin64/tmp";
230#else
231    tmpdir = "c:/cygwin/tmp";
232#endif
233  }
234  _snprintf(name, sizeof(name), "%s\\atfile_XXXXXX", tmpdir);
235
236  rc = _mktemp_s(name, strlen(name)+1);
237  if (rc) {
238    fprintf(stderr, "Could not create temporary file name for at file!\n");
239    exit(-1);
240  }
241
242  atout = fopen(name, "w");
243  if (atout == NULL) {
244    fprintf(stderr, "Could not open temporary file for writing! %s\n", name);
245    exit(-1);
246  }
247
248  buffer = (char*) malloc(buflen);
249  while ((blocklen = fread(block, 1, sizeof(block), atin)) > 0) {
250    append(&buffer, &buflen, &used, block, blocklen);
251  }
252  buffer[used] = 0;
253  if (getenv("DEBUG_FIXPATH") != NULL) {
254    fprintf(stderr, "fixpath input from @-file %s: %s\n", &in[1], buffer);
255  }
256  fixed = replace_cygdrive(buffer);
257  if (getenv("DEBUG_FIXPATH") != NULL) {
258    fprintf(stderr, "fixpath converted to @-file %s is: %s\n", name, fixed);
259  }
260  fwrite(fixed, strlen(fixed), 1, atout);
261  fclose(atin);
262  fclose(atout);
263  free(fixed);
264  free(buffer);
265  files_to_delete[num_files_to_delete] = (char*) malloc(strlen(name)+1);
266  strcpy(files_to_delete[num_files_to_delete], name);
267  num_files_to_delete++;
268  atname = (char*) malloc(strlen(name)+2);
269  atname[0] = '@';
270  strcpy(atname+1, name);
271  return atname;
272}
273
274// given an argument, convert it to the windows command line safe quoted version
275// using rules from:
276// http://blogs.msdn.com/b/twistylittlepassagesallalike/archive/2011/04/23/everyone-quotes-arguments-the-wrong-way.aspx
277// caller is responsible for freeing both input and output.
278char * quote_arg(char const * in_arg) {
279  char *quoted = NULL;
280  char *current = quoted;
281  int pass;
282
283  if (strlen(in_arg) == 0) {
284     // empty string? explicitly quote it.
285     return _strdup("\"\"");
286  }
287
288  if (strpbrk(in_arg, " \t\n\v\r\\\"") == NULL) {
289     return _strdup(in_arg);
290  }
291
292  // process the arg twice. Once to calculate the size and then to copy it.
293  for (pass=1; pass<=2; pass++) {
294    char const *arg = in_arg;
295
296    // initial "
297    if (pass == 2) {
298      *current = '\"';
299    }
300    current++;
301
302    // process string to be quoted until NUL
303    do {
304      int escapes = 0;
305
306      while (*arg == '\\') {
307        // count escapes.
308        escapes++;
309        arg++;
310      }
311
312      if (*arg == '\0') {
313         // escape the escapes before final "
314         escapes *= 2;
315      } else if (*arg == '"') {
316        // escape the escapes and the "
317        escapes = escapes * 2 + 1;
318      } else {
319         // escapes aren't special, just echo them.
320      }
321
322      // emit some escapes
323      while (escapes > 0) {
324        if (pass == 2) {
325          *current = '\\';
326        }
327        current++;
328        escapes--;
329      }
330
331      // and the current char
332      if (pass == 2) {
333        *current = *arg;
334      }
335      current++;
336    } while (*arg++ != '\0');
337
338    // allocate the buffer
339    if (pass == 1) {
340      size_t alloc = (size_t) (current - quoted + (ptrdiff_t) 2);
341      current = quoted = (char*) calloc(alloc, sizeof(char));
342    }
343  }
344
345  // final " and \0
346  *(current - 1) = '"';
347  *current = '\0';
348
349  return quoted;
350}
351
352int main(int argc, char const ** argv)
353{
354    STARTUPINFO si;
355    PROCESS_INFORMATION pi;
356    unsigned short rc;
357
358    char *line;
359    char *current;
360    int i, cmd;
361    DWORD exitCode = 0;
362    DWORD processFlags = 0;
363    BOOL processInheritHandles = TRUE;
364    BOOL waitForChild = TRUE;
365
366    if (argc<2 || argv[1][0] != '-' || (argv[1][1] != 'c' && argv[1][1] != 'm')) {
367        fprintf(stderr, "Usage: fixpath -c|m<path@path@...> [--detach] /cygdrive/c/WINDOWS/notepad.exe [/cygdrive/c/x/test.txt|@/cygdrive/c/x/atfile]\n");
368        exit(0);
369    }
370
371    if (getenv("DEBUG_FIXPATH") != NULL) {
372      char const * cmdline = GetCommandLine();
373      fprintf(stderr, "fixpath input line >%s<\n", strstr(cmdline, argv[1]));
374    }
375
376    if (argv[1][1] == 'c' && argv[1][2] == '\0') {
377      if (getenv("DEBUG_FIXPATH") != NULL) {
378        fprintf(stderr, "fixpath using cygwin mode\n");
379      }
380      replace_cygdrive = replace_cygdrive_cygwin;
381    } else if (argv[1][1] == 'm') {
382      if (getenv("DEBUG_FIXPATH") != NULL) {
383        fprintf(stderr, "fixpath using msys mode, with path list: %s\n", &argv[1][2]);
384      }
385      setup_msys_path_list(argv[1]);
386      replace_cygdrive = replace_cygdrive_msys;
387    } else {
388      fprintf(stderr, "fixpath Unknown mode: %s\n", argv[1]);
389      exit(-1);
390    }
391
392    if (argv[2][0] == '-') {
393      if (strcmp(argv[2], "--detach") == 0) {
394        if (getenv("DEBUG_FIXPATH") != NULL) {
395          fprintf(stderr, "fixpath in detached mode\n");
396        }
397        processFlags |= DETACHED_PROCESS;
398        processInheritHandles = FALSE;
399        waitForChild = FALSE;
400      } else {
401        fprintf(stderr, "fixpath Unknown argument: %s\n", argv[2]);
402        exit(-1);
403      }
404      i = 3;
405    } else {
406      i = 2;
407    }
408
409    // handle assignments
410    while (i < argc) {
411      char const * assignment = strchr(argv[i], '=');
412      if (assignment != NULL && assignment != argv[i]) {
413        size_t var_len = (size_t) (assignment - argv[i] + (ptrdiff_t) 1);
414        char *var = (char *) calloc(var_len, sizeof(char));
415        char *val = replace_cygdrive(assignment + 1);
416        memmove(var, argv[i], var_len);
417        var[var_len - 1] = '\0';
418        strupr(var);
419
420        if (getenv("DEBUG_FIXPATH") != NULL) {
421          fprintf(stderr, "fixpath setting var >%s< to >%s<\n", var, val);
422        }
423
424        rc = SetEnvironmentVariable(var, val);
425        if (!rc) {
426          // Could not set var for some reason.  Try to report why.
427          const int msg_len = 80 + var_len + strlen(val);
428          char * msg = (char *) alloca(msg_len);
429          _snprintf_s(msg, msg_len, _TRUNCATE, "Could not set environment variable [%s=%s]", var, val);
430          report_error(msg);
431          exit(1);
432        }
433        free(var);
434        free(val);
435      } else {
436        // no more assignments;
437        break;
438      }
439      i++;
440    }
441
442    // remember index of the command
443    cmd = i;
444
445    // handle command and it's args.
446    while (i < argc) {
447      char const *replaced = replace_cygdrive(argv[i]);
448      if (replaced[0] == '@') {
449        if (waitForChild == FALSE) {
450          fprintf(stderr, "fixpath Cannot use @-files in detached mode: %s\n", replaced);
451          exit(1);
452        }
453        // Found at-file! Fix it!
454        replaced = fix_at_file(replaced);
455      }
456      argv[i] = quote_arg(replaced);
457      i++;
458    }
459
460    // determine the length of the line
461    line = NULL;
462    // args
463    for (i = cmd; i < argc; i++) {
464      line += (ptrdiff_t) strlen(argv[i]);
465    }
466    // spaces and null
467    line += (ptrdiff_t) (argc - cmd + 1);
468    // allocate
469    line = (char*) calloc(line - (char*) NULL, sizeof(char));
470
471    // copy in args.
472    current = line;
473    for (i = cmd; i < argc; i++) {
474      ptrdiff_t len = strlen(argv[i]);
475      if (i != cmd) {
476        *current++ = ' ';
477      }
478      memmove(current, argv[i], len);
479      current += len;
480    }
481    *current = '\0';
482
483    if (getenv("DEBUG_FIXPATH") != NULL) {
484      fprintf(stderr, "fixpath converted line >%s<\n", line);
485    }
486
487    if (cmd == argc) {
488       if (getenv("DEBUG_FIXPATH") != NULL) {
489         fprintf(stderr, "fixpath no command provided!\n");
490       }
491       exit(0);
492    }
493
494    ZeroMemory(&si, sizeof(si));
495    si.cb=sizeof(si);
496    ZeroMemory(&pi, sizeof(pi));
497
498    fflush(stderr);
499    fflush(stdout);
500
501    rc = CreateProcess(NULL,
502                       line,
503                       0,
504                       0,
505                       processInheritHandles,
506                       processFlags,
507                       NULL,
508                       NULL,
509                       &si,
510                       &pi);
511    if (!rc) {
512      // Could not start process for some reason.  Try to report why:
513      report_error("Could not start process!");
514      exit(126);
515    }
516
517    if (waitForChild == TRUE) {
518      WaitForSingleObject(pi.hProcess, INFINITE);
519      GetExitCodeProcess(pi.hProcess, &exitCode);
520
521      if (getenv("DEBUG_FIXPATH") != NULL) {
522        for (i=0; i<num_files_to_delete; ++i) {
523          fprintf(stderr, "fixpath Not deleting temporary file %s\n",
524                  files_to_delete[i]);
525        }
526      } else {
527        for (i=0; i<num_files_to_delete; ++i) {
528          remove(files_to_delete[i]);
529        }
530      }
531
532      if (exitCode != 0) {
533        if (getenv("DEBUG_FIXPATH") != NULL) {
534          fprintf(stderr, "fixpath exit code %d\n",
535                  exitCode);
536        }
537      }
538    } else {
539      if (getenv("DEBUG_FIXPATH") != NULL) {
540        fprintf(stderr, "fixpath Not waiting for child process");
541      }
542    }
543
544    exit(exitCode);
545}
546